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Fig. 4. ADA activity of salivary homogenates of P. duboscqi. A cuvette
containing 20 µM adenosine in PBS was scanned at 3 min intervals for 30 min
following addition of salivary homogenate equivalent to 0.2 pairs of salivary
gland from P. duboscqi (A) and P. papatasi (B). (C)
Differential spectra of the data in (A) obtained by subtracting each scan from
the scan at time zero. The arrows indicate the direction of change of the
spectrum over time.